Metal cutting machine



Nov. 7, 1933. F. MOLLER 1 1,934,202

METAL CUTTING MACHINE Filed Oct. 14, 1951 Patented Nov. 7, 1933 1,934,202 METAL cu'r'rme mom Fritz Miiller, Duisburg, Germany Application October 14, 1931, Serial No. 568,712, and in Germany August 11, 1930 illairns. (01. 164-49) Metal shearing machines for cutting ofi lengths of rolled material under movement are, as now manufactured, provided with two knives, an upper and a lower, and these knives, mounted either- 5 in a reciprocating slide or on rotating shafts, are positively moved towards each other in. order to efiect the cutting operation. Machines so constructed have the disadvantage that when oi the knife shaft-consequently the bars to be cut may differ in length, according to the periphcry of the circles described by the knives.

The known types of shearing mechanisms, more particularly flying shears, whose upper and lower knives are caused to reciprocate by a crank slide guide have the further disadvantage that during the actual cutting the bar to be cut and the knives must move at identical speeds.

According to the invention, the lower lmiie is dispensed with, w

on a plunger, whl

hile the other knife is mounted ch is depressed by a spring or falls under gravity, an anvil, shaped like a roller and rotating during the operation of the shearing mechanism, being provided as a base or support for the material.

The apparatus according to the invention is so constructed that the gearing which serves to rotate the anvil also returns the plunger with the knife, after the cutting operation, to the ini= tial position. During this time the knife is held in the direction or movement of the work, while being capable of so provided that swinging outwardly, and it is it is retained in the operative position. under gravity.

The accompanying drawing illustrates, by way of example, one according to the construction of the apparatus invention.

Figure 1 illustrates the apparatus in side eleration,

lhgure 2 is a section on the line A-B of Figure 1, and

Figures 3 and 4 Figure 5 is a detail of the knife. The apparatus sists principally of a are illustrations of detail parts.

view illustrating the mountaccording to the invention conplunger 1, which is capable of vertical reciprocation in the frame 2 under the action of a spring 3,

which is confined in the head 4 of the frame 2 and presses against the upper end or shoulder of the plunger 1. The plunger 1 is provided with an easily changed knife 5, which is so pivoted at 6 in the plunger 1 that it is held under gravity in the position shown in Figure 1 against a stop and can turn therefrom towards the right, in the anti-clockwise direction. Working in conjunction with the 6 knife is the cylindrical anvil '1, which is mounted on a shaft 8; this shaft is driven by a motor not shown in the drawing. A channel section guide 9 is provided in front of the anvil, and in it the rolled material is pushed iorward in the direction indicated by the arrow. The plunger 1 is held by a pawl 10 in its initial position, the pawl engaging in the notch 11 on the plunger. The pawl 10 is secured to the spindle 13 on which is also fitted the hand lever 12; the spindle 13 carries a toothed segment 14 which engages in a segment 15 provided on the spindle l6. This'spi'ndle has mounted upon it a rocking member 17, the upper edge 18 of which acts upona pawl 20 to render it inoperative. The pawl 20 is pivoted to a lever 21 so as to be easily movable, and this lever 21 is moved to and fro through an angle of 90 under the action of the lever 22 fixed to its spindle and a rod 23. The reciprocatory movement of the pawl 20 is efiected from the driving gear of the anvil 1, a gear wheel upon the shaft 8 engaging in a gear wheel 32 on a shaft 34 on which is. a crank 33 connected to the rod 23.

The purpose of the pawl 20 is to engage in one of the four equally spaced indentations 24 in the disc 25, after the knife has descended, in order to turn this disc through an angle of The indented disc is secured to a toothed wheel 26, which in turn engages a pinion 27. A cam 29 is keyed to the spindle 28 of the pinion 27, and 90 co-operates with a roller 30 on the plunger 1.

The apparatus operates as follows:

If it is desired to cut through a rolled bar which has been placed under the knife 5; the lever 12 is raised against the action of its spring 31, which action releases the pawl 10. The spring 3 causes the plunger 1 to descend rapidly until it reaches the anvil 7. The knife 5 thus cuts through the bar, and it is then moved round by the rotating anvil in the direction of movement of the anvil, so that it does not impede the further movement of the bar on its way through. The knife 5 swings freely about its pivot 6 after making the cut.

.At the same time as the pawl 10 is released 10 the rocking member 1'? turns a certain distance to the left, so that the reciprocating pawl 20 drops into one of the indentations in the disc 25 and, on its return movement moves the disc round one quarter of a turn forward. This partial rotation of the disc 25 causes the cam 29 to make one complete rotation, and the cam engages under the roller 30 on the plunger and returns it to the position shown in Figure 1. The pawl 10 will slip back into the recess 11 under the action of the spring 31. As shown in Figure 1, the cam 29 has already raised the plunger 1 and left the roller 30. The distance of the roller 30 from the hub. of the cam 29 is determined according to the stroke of the plunger 1.

I claim:

1. Apparatus for cutting ofi lengths from bars under movement, comprising a rotatable anvil, a plunger adapted to fall from an elevated. position in the direction of the anvil and a knife pivoted upon the said plunger with freedom of movement to permit it to swing in the direction of travel of the bars, the said knife cutting the bar passing over the anvil and being turned about its pivotal point by the bar as the bar is driven forward.

2. Apparatus for cutting off lengths from bars under movement, comprising a rotatable anvil over which the bars to be out are fed, a plunger adapted to fall from an elevated position in the direction of the anvil, a knife pivoted upon the plunger with freedom of movement to permit it to swing in the direction of travel of the bars, means for positively rotating the anvil to drive forward the bar being cut and means whereby the plunger is returned to the initial position.

3. Apparatus for cutting ofi lengths from bars under movement, according to claim 2, comprising a rotatable cam for lifting the plunger, said cam being brought into operation after the plunger has fallen and being then rotated from the means for rotating the anvil.

4. Apparatus for cutting off lengths from bars under movement, comprising a rotatable anvil, a plunger adapted to fall from an elevated position in the direction of the anvil, a knife pivotally carried by the said plunger, means for rotating theanvil, a rotatable cam for lifting the plunger, an indented disc, reciprocating pawl gear for intermittently rotating said indented disc, and gearing between said indented disc and said cam whereby said cam is rotated for each movement of said disc.

5. Apparatus for cutting off lengths from bars under movement, according to claim 4, comprising a pawl catch for engaging said plunger in the uplifted position, a pawl release element adapted to render the reciprocating pawl gear ineifective when said pawl catch is engaged with said plunger, inter-connecting mechanism between said pawl catch and said pawl release element, and means for releasing said pawl catch and rendering inoperative said pawl release member.

FRITZ MCiLLER.

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